He pouaka whakamarumaru kanohi-a-whaiaro tenei, na te mea kaore he anga o roto. Ko tona roa he 140mm, he 102mm te whanui, he 11mm te teitei. Ko te whakamahinga o tenei hua ko te tono i tetahi aukume ngohengohe nui ki te Negri, katahi ka tuu te pereti rino kei roto te poaka ki runga ki te whakauru.